Raspberry Pi Sense HAT

The Raspberry Pi's Sense HAT (also known as the Astro Pi HAT) is a device that sits on top of the Raspberry Pi device. It has an on-board accelerometer, magnetometer, gyroscope, thermometer, barometer, and humidity sensor, all of which pass data back to the Pi via I2C communication. In addition to these sensors, it has an 8×8 LED array that can be used to display information and a five-way joystick that can be used for input.

Sense HAT on a Raspberry Pi B (courtesy of the Raspberry Pi Foundation).